GEOLOGY

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EARTH SCIENCE

MAGNETISM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
Angela tries to pick up a copper penny using a bar magnet, but the penny does not move. Then she tries to pick up an iron nail using the bar magnet, and the nail lifts up towards the magnet. Her teacher tells her that the magnet lifts the iron nail because it is a ferromagnetic material. Which of the following best describes a ferromagnetic material?
A
A material that easily conducts electricity
B
A material that produces its own magnetic field
C
A material with naturally strong magnetic properties
D
A material made of non-metals that produce magnetic fields
Explanation: 

Detailed explanation-1: -Copper and alloys primarily based upon copper are considered non-magnetic. This is because of its atomic structure. In nature, magnetism in metals is a result of an uneven distribution of electrons within the atomic structure of the magnetic material-electrons flow from one ‘shell to the next and free to spin.

Detailed explanation-2: -If you have a strong enough magnetic field all matter is magnetic. But copper is so weakly magnetic that we can’t observe it without very, very large magnetic fields. So the short answer is “No, copper isn’t magnetic.” This can quickly be tested by trying to pick up a penny with a magnet.

Detailed explanation-3: -The phenomenon of a magnetic substance acquiring magnetism due to the presence of a magnetic material around it is known as magnetism. When a bar magnet is brought near an iron nail, the iron nail gets magnetised.

Detailed explanation-4: -Given a piece of iron and a bar magnet, the piece of iron can be magnetised by single touch method wherein one pole of a magnet is used to stroke the iron piece from its one end to the other end repeatedly until it gets magnetised.

There is 1 question to complete.
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